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I W. 0. TALGOTT. DIE FOR BENDING TEETH 0F SHEET METAL BELT FASTENERS.

Patented Aug. 28,1894.

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I UNrrno STATES PATENT Orrrcs.

WALTER O. TALCOTT, OF PROVIDENCE, RHODE ISLAND.

DIE FOR BENDING TEETH OF SHEEl' METAL BELT-FASTENERS.

SPECIFICATION forming part of Letters Patent No. 525,124, dated August28, 1894.

Application filed April 9, 1894. Serial No. 50 .8 mbmodeld To all whomit may concern.-

13c it known that I, WALTER O. TALOOTT, a citizen of the United States,residing at Providence, in the county of Providence and State of RhodeIsland, have invented certain new and usefullmprovements in Dies forBending the Teeth of Sheet-Metal Belt-Fasteners; and I do hereby declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and

to the letters of reference marked thereon,

which form a part of this specification.

In United States Patent No; 431,103, granted to E. L. Budlong July 1,1890, is described a referred to have been overcome.

novel belt-fastener; the same being made of sheet-metal and having theteeth or prongs thereof arranged along the edges of the plate andobliquely to its axes, the teeth being bent downwardly and past theplane of the perpendicular. I The object I have in view in my presentinventlon is to provide means for deflecting or setting the prongs ofsheet metal belt-fasteners, such for example as the patented fastenerust referred to. Y

To that end my invention consists essentlally of a die having a seriesof oblique or lnclined holes formed in its working face, said holesbeing so located and arranged that the teeth of the fastener upon beingpressed therein are simultaneously bentor deflected from the plane of aperpendicular, thereby imparting to them a hooked form; it furtherconsists in the combination with a fixed die having a concave face, ofa, movable die having a convex face in which is formedaseries of obliqueorinclined holes, all as will be more fully hereinafter set forth andclaimed. By means of my improved die the teeth of the fastener may bebent more uniformly and rapidly. Moreover, the dieitself iscomparatively inexpensive; it is easily set and ad- Justed and is bothstrong and durable and not liable to become broken in use, since thebending cavities present no angular surfaces. Another advantage is thatthe flat base of the fastener may be converted into a slightly curved orconvex shape simultaneously with \view of the die.

ing side of the die, thus producing imperfect and unsalable fasteners.

In my present invention the defects just Each diecavity is independentwith respect to the other cavities and is adapted 'to receivea tooth andat the same time to centralize it and bend it to the required shape orangle. And since all the cavities of the die are alike in form itfollows that the several teeth of the fastener will at one operation besimultaneously centralized and deflected, thereby not only greatlyreducing the percentage of imperfect fasteners but at the same time sobending the prongs that the points thereof along each edge of thefastener-base are in true alignment. The present die is the one referredto in my pending application for Letters Patent, Serial No. 506,337,filed April 4, 1894. g

In the accompanying sheet of drawings, Figures 1 and 2 are perspectiveviews of sheet-metal belt-fasteners, provided with teeth or hooks bentor inclined from the plane of the perpendicular. Fig. 3 is a side viewof my improved die adapted for thus bending-the fastener-teeth. Fig. 4is a transverse sectional view, taken on line a: m of Fig. 3, and alsoshowing the stationary or fellow die member. -Fig. 5 is an inverted faceFig. 6 is a side view of the die, the die-cavities being formed in asingle block. Fig.7 is an end view of the same. Fig. 8 is an end view ofthe two die-members having curved faces arranged to bend the plate ofthe fastener simultaneously with the bending of the teeth. Fig. 9 is anend view of the thus bent fastener, and Fig-1O isan end View of the dieprovided with a modified form of the bending cavities.

Sheet-metal belt-fasteners having straight teeth, that is, teeth bent atsubstantially right angles with the plane of the table or base of thefastener, are well-known. It is found to be advantageous to employfasteners having the teeth further bent or hooking, as it is sometimestermed, that is, fasteners in which the teeth are inclined past theplane of the perpendicular. Such a fastener is represented in thedrawings at A, Figs. 1 and 2; the prongs p, integral with the base 19,being inclined from the perpendicular. In order to thus bend the prongsI have devised the die a forming the subject of my present invention.The die may be removably secured to any suitable holder or head a,adapted to be secured to the plunger of a press, and provided with anywell-known knock-off device; as for.

example, the movable rod cl extending vertitically through the die andholder and arranged to contact with a stop as common. The die a may beformed in one piece, as in Figs. 6 and 7, or it may be composed of aseries of interchangeable multiple smaller dies, as shown in Figs. 3, atand 5. In the latter case removable side cheeks f are employed forclamping them in position in the holder.

The lower or working face of the die is provided with a series ofprong-bending cavities 0, each being drilled therein at an angle withboth axes of the working face. The shape of the cavity or recess 0 maybe cone-shaped, as shown say in Figs. 3 and 5, or uniform in diameterthroughout its length or depth, as in Fig. 10.

In order to deflect or incline the previously bent teeth the fastener is'first placed, inverted, on the seat of the lower die-member b, asindicated in Fig. 4, followed by depress ing the die (1, thereby forcingthe sides of the die-cavities 0 into engagement with the correspondingprong-points, thus simultaneously centralizing and gradually deflectingall of the prongs uniformly and completing the bending operation. Thefastener after being thus bent and detached from the die is representedat A in Fig. 1.

When the fastener-plate or base 19 is to be curved or bent I employ astationary diemember b having a concave seat I), the corresponding orcoacting face a of the upper die a being convex. See Fig. 8. In thiscase the several prongs are inclined simultaneously with the bending ofthe base. Fig. 9 is an end view of a thus-bent sheet-metal beltfastener.

I claim as my invention- 1. The prong centralizing and bending die,substantially as hereinbefore described, provided with a series ofsuitably arranged independent holes or die-cavities in its working face,each of said die-cavities being substantially cone-shape and having itslongitudinal axis inclined with respect to the die-face, constructed andarranged whereby the previously bent prongs of a belt-fastener uponbeing pressed therein are simultaneously centralized and bent orinclined from the plane of a perpendicular.

2. The prong-bending die hereinbefore described, consisting of the heador holder portion, a series of die-blocks removably secured to saidholder having oblique holes or bending cavities 0 formed therein, and aclearing device attached to and forming a part of the die.

3. The combination with a fixed die having a concave face, of a movablefellow die having a convex working surface provided with a series ofobliquely formed bending cavities 0 arranged to receive and deflect theprongs of belt-fasteners, and means for clearing or detaching thefasteners from the die, substantially as hereinbefore set forth.

In testimony whereof I have affixed my sig- 7 nature in presence of twowitnesses.

WALTER O. TALCOTT.

WVitnesses:

GEo. I-I. REMINGTON, CHARLES H. I-lrsoox.

